Features support for Apple Find My. Up to 800 hours of battery life, an automatic terrain selector, +/-1% accuracy, waterproof, light weight (9g), low profile, indicator light, ANT+ Bluetooth. Backed by an industry leading 3 year warranty. While you are riding, Precision 3+ Power Meter will transmit watts, cadence, and calories to your head unit of choice. While the power meter is not in use, Find My is enabled and allows you to see its location on a map. You can add your power meter to the Find My app and locate it on an iPhone, iPad, Mac or using the Find Items app on an Apple Watch . CR2032 coin cell battery. 30-170 RPM cadence range. 0-4000 W power range